package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/*
    自定义切面类（AOP）
 */
@Aspect
@Component
@Slf4j
public class AutoFillaspect {

    /*
        先用pointcut定义可重复使用的切点位置
        之后就能使用这个方法上定义的切点 @Before("autoFillPointCut()")
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..))&& @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        //获得当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();

        //获得当前被拦截方法的参数
        Object[] args = joinPoint.getArgs();
        Object entity = args[0];

        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据不同的操作类型，分别赋值
        if(operationType==OperationType.INSERT)
        {
            /*
                反射获取目标方法以及参数类型
             */
            Method setCreateTime = entity.getClass().getDeclaredMethod("setCreateTime", LocalDateTime.class);
            Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
            Method setCreateUser = entity.getClass().getDeclaredMethod("setCreateUser", Long.class);
            Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);

            //通过反射为对象属性赋值
            setCreateTime.invoke(entity,now);
            setCreateUser.invoke(entity,currentId);
            setUpdateTime.invoke(entity,now);
            setUpdateUser.invoke(entity,currentId);
        }
        else {
            Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
            Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);
            setUpdateTime.invoke(entity,now);
            setUpdateUser.invoke(entity,currentId);
        }

    }
}
